28040687 has 8 divisors (see below), whose sum is σ = 29089104. Its totient is φ = 27010368.

The previous prime is 28040659. The next prime is 28040699. The reversal of 28040687 is 78604082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28040687 - 2⁸ = 28040431 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (3636138).

Almost surely, 2^28040687 is an apocalyptic number.

28040687 is a deficient number, since it is larger than the sum of its proper divisors (1048417).

28040687 is an equidigital number, since it uses as much as digits as its factorization.

28040687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 28040687 is about 5295.3457866319. The cubic root of 28040687 is about 303.8059089734.

The spelling of 28040687 in words is "twenty-eight million, forty thousand, six hundred eighty-seven".